Foreign institutional investors (FIIs) were net buyers of Rs 111.90 crore on Thursday, January 18, according to data released by Sebi today.While FIIs made gross purchases of Rs 2,531.70 crore, gross sales totalled Rs 2,419.80 crore.Mutual funds (MFs) were net buyers of Rs 58.95 crore on Thursday. MFs made purchases of Rs 691.47 crore and sales of Rs 632.52 crore.